$ git clone -n https://src.fedoraproject.org/rpms/tcpreen.git /var/lib/mock/f41-build-side-1-2670539-29059/root/chroot_tmpdir/scmroot/tcpreen
Cloning into '/var/lib/mock/f41-build-side-1-2670539-29059/root/chroot_tmpdir/scmroot/tcpreen'...
$ git fetch origin 87fe9cd273e99ff6fbb6b104b3c95cc334202109:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcpreen
 * [new ref]         87fe9cd273e99ff6fbb6b104b3c95cc334202109 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87fe9cd convert GPLv2 license to SPDX